I bought a Bush Hog brand PG720 about 10 years ago. It does a great job, and really helps in the pasture, and hay field. I used solid core cement blocks on it for weight, for good penetration.
I found mine by doing a lot of searching on the internet. I decided on the model I wanted, then scoured many pages of Google search, entering that model number. You'll get a lot more hits that way, then just searching dealer sites.
This one was a nos sitting around for a couple years at a smaller dealer, and just wanted it off his lot. At the time, when others were asking approx. $1200.00 for the same model, I got this one for $800.00 out the door.
To date, no broken spoons, or any other breakage, and that's running it over approx. 9 acres of pasture & hay ground per year.